Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Motorola VX-261 Replacement Battery FNB-V133Li 7.4V

Up to 19% off
New arrival
From $42.99 USD $52.99
Shipping calculated at checkout.
Fits Motorola VX-261, VX-264, VX-451, EVX-531 radios replacing FNB-V133Li, FNB-V134Li, FNB-V138Li original packs.
Delivers 7.4V at 2200mAh capacity; sustains full transmit power across extended shifts without voltage sag.
Connector slides into radio slot with positive terminal forward; locking tab seats flush against radio housing.
We bench tested this cell in a VX-261 under sustained PTT cycles; BMS accepted dock handshake cleanly on first insertion.
If the charger dock shows a fault LED after inserting this pack, remove it, wipe the gold contact strip dry, and reseat firmly—the Motorola platform requires clean contact acceptance before the BMS begins charging.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

2200mAh

Motorola VX-261 / VX-264 / VX-451 — 7.4V Li-ion Replacement Battery (FNB-V133Li)

This 7.4V, 2200mAh Li-ion battery replaces the FNB-V133Li, FNB-V134Li, FNB-V138Li, AAJ67X001, AAJ68X001, and AAK66X501 packs. It fits the Motorola VX-261, VX-264, VX-451, and EVX-531 portable two-way radios. The pack slots into the standard battery bay and mates with the existing charger dock without modification.

  • VX-261 / VX-264 / VX-451 / EVX-531 platform fit: These models share a common 7.4V battery bay, connector pinout, and BMS handshake protocol. One pack covers the full group — no adapter or cable change needed.
  • Bench tested on actual hardware: We ran this pack through a VX-261 charger dock and confirmed BMS communication, charge acceptance, and correct LED sequencing from fault-clear through to full-charge indication.
  • First insertion on Vertex charger docks: If the dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Vertex platform requires a clean contact cycle to complete the BMS handshake before charging begins.

Why the VX-261 cuts out mid-transmission on a fresh battery

When a new cell arrives at storage voltage — typically 3.7V to 3.8V per cell — the BMS may trigger an overcurrent trip the moment PTT is pressed. Transmit current on the VX-261 spikes sharply above the draw at standby, and the BMS treats that spike as a fault if cell voltage is below its operating window. The fix is to seat the battery in the charger dock and let it reach at least 7.2V before the first transmission. One full charge cycle clears this completely.

Bar indicator showing one fewer bar than expected on a new pack

The VX-series radio reads bars from voltage thresholds only — it has no fuel gauge chip. A new cell at storage voltage sits below the top threshold, so the radio displays one or two bars even though the pack is not depleted. This is not a faulty cell or a capacity issue. Charge the pack fully in the dock until the LED goes green, then power on the radio — the indicator will show the correct level at 8.2V to 8.4V full charge.

Compatible Models

VX-261 VX-264 VX-451 EVX-531 EVX-534 EVX-539

Replaces Part Numbers

FNB-V133Li FNB-V134Li FNB-V138Li AAJ67X001 AAJ68X001 AAK66X501

Technical Specifications

Voltage7.4V
Amp Hours2200mAh
Capacity2200mAh
Rate16.28Wh
Net Weight139g /4.90 oz
Gross Weight319g /11.25 oz
Approximate Weight319g /11.25 oz
Dimension 111.80 X 57.90 X 35.40 mm

Product Highlights

  • Brand: Motorola
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The dock LED blinks amber and never starts charging — what's actually happening?

When a pack sits in storage for an extended period, cell voltage can drop below the dock's acceptance threshold, and the charger refuses to begin a charge cycle rather than risk an unsafe recovery. Remove the pack, wipe the gold contact strip clean, and reseat it firmly to confirm the BMS handshake is completing. If the LED still blinks, the cell may be below recovery voltage — place the pack in a known-good Vertex rapid charger rather than a desktop dock, as rapid chargers apply a low-current pre-charge to bring the cell back above 6.0V before switching to full charge.

Radio drops to noticeably weaker audio on transmit partway through a shift — is the battery failing or is this normal?

This is voltage sag under sustained RF output. As the VX-261 holds PTT for extended transmissions, draw stays high and cell voltage dips — the radio's power management circuit steps down TX output to protect the pack. A degraded or deeply cycled cell sags earlier and harder than a fresh one. If you see this on a new pack after the first full charge cycle, confirm the dock brought the pack to a full 8.2V–8.4V before use; a partial first charge leaves the cell short of its working headroom.

Pack seats correctly and the dock goes green, but the radio shows low bars within the first hour of use — is this a capacity defect?

The VX-series bar display reads voltage thresholds, not stored energy, so a cell with elevated internal impedance will show a fast voltage drop under load even if the pack charged to full terminal voltage. We measured this on the bench — impedance mismatch between a new cell and an aged radio circuit can cause the first bar to drop within minutes of heavy PTT use before stabilising. Run the pack through two full charge-discharge cycles on the radio; cell impedance typically normalises after conditioning and the bar reading will stabilise at a level consistent with actual charge state.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Yaesu VX-260 Replacement Battery, 7.4V, 2200mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections